feat: enhance group duty pin command functionality

- Updated the `pin_duty_cmd` to handle cases where no message ID is found by sending a new duty message, pinning it, saving the pin, and scheduling the next update.
- Improved error handling for message sending and pinning operations, providing appropriate replies based on success or failure.
- Enhanced unit tests to cover the new behavior, ensuring proper functionality and error handling in various scenarios.

webapp/js/dayDetail.js

@@ -52,7 +52,9 @@ export function buildDayDetailContent(dateKey, duties, eventSummaries) {
       ? t(lang, "duty.today") + ", " + ddmm
       : ddmm;
 
-  const dutyList = (duties || []).filter((d) => d.event_type === "duty");
+  const dutyList = (duties || [])
+    .filter((d) => d.event_type === "duty")
+    .sort((a, b) => new Date(a.start_at || 0) - new Date(b.start_at || 0));
   const unavailableList = (duties || []).filter((d) => d.event_type === "unavailable");
   const vacationList = (duties || []).filter((d) => d.event_type === "vacation");
   const summaries = eventSummaries || [];